US4413815A - Device for blowing swirling gas into a metal refinery converter - Google Patents

Device for blowing swirling gas into a metal refinery converter Download PDF

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Publication number
US4413815A
US4413815A US06/370,652 US37065282A US4413815A US 4413815 A US4413815 A US 4413815A US 37065282 A US37065282 A US 37065282A US 4413815 A US4413815 A US 4413815A
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United States
Prior art keywords
tuyeres
tube
converter
gas
tuyere
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Expired - Fee Related
Application number
US06/370,652
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English (en)
Inventor
Roger Duhomez
Guy Quenton
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FRANCAISE DES ACIERS SPECIAUX Cie
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FRANCAISE DES ACIERS SPECIAUX Cie
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Assigned to COMPAGNIE FRANCAISE DES ACIERS SPECIAUX reassignment COMPAGNIE FRANCAISE DES ACIERS SPECIAUX ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DUHOMEZ, ROBER, QUENTON, GUY
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/48—Bottoms or tuyéres of converters
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/35—Blowing from above and through the bath
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases

Definitions

  • the present invention relates to a tuyere device for blowing swirling gas into a converter for the lance refining of liquid metals, for example a steelworks converter.
  • Such a swirling gas can be a neutral gas, e.g., nitrogen or argon, or an oxidizing and cooling gas, such as steam or carbon dioxide, or a low-oxidizing gas, e.g., ordinary air, but excluding strongly oxidizing gases, such as pure oxygen, which would cause much too rapid wear of the tuyeres according to the invention.
  • a neutral gas e.g., nitrogen or argon
  • an oxidizing and cooling gas such as steam or carbon dioxide
  • a low-oxidizing gas e.g., ordinary air, but excluding strongly oxidizing gases, such as pure oxygen, which would cause much too rapid wear of the tuyeres according to the invention.
  • porous refractories the open and, possibly, orientated porosity of which enables gas to be channelled under pressure through the refractory mass.
  • permeable elements consisting of compact refractory bricks, the joints between bricks forming very narrow passages which, nevertheless, are permeable to gases under pressure.
  • These permeable passages are produced either by a designed assembly of metal plates surrounding each of the bricks or by moving together bricks, which have been previously sawn and to both sides of which very thin metal wires have been attached.
  • the object of the present invention is to make it possible, in good conditions of industrial application, for the blowing of swirling gas to take place through the bottom of a converter and, in case of need, even through its side coating, and this even if the temperature of the metal bath to be refined considerably exceeds 1660° C. and even if the deposit of basic slag on the blowing device is thin or non-existent.
  • the subject of the present invention is a device for blowing swirling gas through the bottom or the wall of a converter for refining liquid metals, consisting of a set of single tube tuyeres, located throughout the entire thickness of the compact refractory coating of the converter and wearing away with the latter.
  • the tube constituting each of the tuyeres is flattened along the whole consumable length of the tuyere, the width of the internal cross-section for the passage of the gas in the flattened tube being, at most, equal to one millimeter and, preferably, approximately 0.5 mm.
  • each of said tubes passes through a steel plate, to which it is brazed, and said steel plate constitutes one of the walls of a distribution chamber between the swirling gas tuyeres, supplied with this gas through a duct, said chamber being fixed by means of said plate to the exterior surface of the sheathing of the converter.
  • each of the tuyeres contains at least one longitudinal metal wire the diameter of which covers the exact width of the flattened part of the tube, which constitutes the tuyere.
  • the steel plate through which all the tubes of the same set of tuyeres pass, has applied to it a coat of tamped, compact refractory material, representing a safety coat, through which said tubes go, following different directions from one another behind said plate.
  • the bricks of the erosive layer of the refractory coating, which overlays the safety coat contain each tube placed in a saw-cut, worked along the whole length of the corresponding brick.
  • the tuyere set is arranged in a straight line and several individual bricks in the same range of the erosive coating can each contain on their edge one of these tuyeres or even two.
  • the tuyere set is arranged along several adjacent and parallel straight lines and, following these straight lines, several individual bricks of the same range of the erosive coating can each contain on their edge one or two of these tuyeres.
  • the installation of this device is easy, easier than that of the known permeable elements.
  • the gas distribution chamber is placed on the outside of the sheathing of the converter; in the depth of the refractory safety coat, the small tubes of the same set are spread out in umbrella fashion and diverge from one another; in the erosive refractory coat, each tube is housed in a saw-cut, worked along the length of the brick. This installation is easier than that of porous plugs or permeable elements.
  • An additional advantage of the device according to the invention is that the principle of assembling the bricks which make up the base or the wall of the refinery container is not affected as a result of the installation of the tuyeres according to the invention.
  • Another advantage of the invention is greater safety.
  • a cavity of, e.g., 30 mm in diameter has to be left in the safety coat, if it is desired to pass a tube of 27 mm through for supplying the porous plug or the permeable element with swirling gas.
  • This cavity presents a certain risk in case of excessive wear or of perforation of the permeable element.
  • the safety coat consists, in the zone of the tuyere set, of a composition of dolomite or of magnesia, tarred, tamped and compact, through which the network of thin tubes passes, greatly limiting the risk of infiltration of liquid steel.
  • the refractory safety coat is penetrated below the swirling gas distribution chamber between the different tuyeres.
  • an individual circuit of each tuyere and not a collective supply system passes through the safety coat. This arrangement greatly limits the seriousness of the consequences of possible metal infiltration into the safety coat.
  • the essential advantage of the blowing device according to the invention is to provide a better resistance of the bottom of the converter to wear in the course of the refining of the bath, and this without the need of producing a permanent protective coat of magnesia slag, deposited on said bottom.
  • FIG. 1 is a vertical section of the device in a four-tuyere row.
  • FIG. 2 is a transverse section of a flattened tube of the first embodiment.
  • FIG. 3 is a transverse section of a flattened tube of the second embodiment.
  • FIG. 4 is a vertical section of the base of the converter, equipped with a set of tuyeres according to the invention on its right hand side and, by way of explanatory comparison, equipped with a porous plug of the known type on its left hand side.
  • FIG. 5 is a horizontal section of a row of bricks of the erosive coat of the refractory base, each containing a groove for the insertion of a flattened tube.
  • FIG. 1 shows four tuyeres 1, 2, 3, 4, the heads 1a, 2a, 3a, 4a of which consist of cylindrical copper tubes, the consumable lengths 1b, 2b, 3b, 4b of which consists of the same tubes as their heads, but flattened according to FIG. 2 or 3, the intermediate parts 1c, 2c, 3c, 4c serving to connect the cylindrical parts with the flattened parts.
  • each of these four tuyeres is brazed on to the steel plate 5 which makes up one of the walls of the distribution chamber 6 supplied with swirling gas through the duct 7.
  • the heads of the tuyeres, at a are tubes of 2 mm internal diameter and 4 mm external diameter.
  • the transverse section of the flattened part which can be seen in 10-fold magnification in FIG. 2, has an internal width of 0.5 mm, an internal length of 2.5 mm, an external width of 2.5 mm and an external length of 4.5 mm.
  • a piano wire of 0.5 mm diameter which is contained in each tuyere over its whole length and the section of which can be seen as 19 in FIG. 2, accurately defines the internal width of the flattened tube at 0.5 mm.
  • the chamber 6 feeds ten tuyeres, only 4 of which are shown in the drawing of FIG. 1, another three being located in front of the drawing of the figure and another three behind that drawing. All are brazed onto the plate 5.
  • the heads of the tuyeres, at a are tubes of 4 mm internal diameter and 6 mm external diameter.
  • the transverse section of the flattened part which can be seen in 10-fold magnification in FIG. 3, has an internal width of 0.5 mm, an internal length of 6 mm, an external width of 2.5 mm and an external length of 8 mm.
  • the chamber 6 feeds 14 tuyeres, only 4 of which are shown in the drawing of FIG. 1, and all of which are brazed on to the plate 5.
  • FIGS. 4 and 5 The installation of a device according to the invention in the bottom of the steelworks converter, under consideration in this example, can be seen in FIGS. 4 and 5.
  • the distribution chamber 6 is fixed by means of the plate 5 to the sheathing 8 of the steelworks converter.
  • the right-hand side of which corresponds to FIG. 1 --the four flattened tubes 1c, 2c, 3c, 4c diverge as from the plate 5 into a coat 9 of tarred, tamped and compact magnesia, located between two bricks 10 and 11 of the safety coating 12 of the refractory base.
  • each of the tubes is housed in a saw-cut 14, which can be seen in FIG. 5 and which is worked along the whole length of each of the corresponding bricks 15a, 15b, 15c, 15d, this length being equal to 500 mm.
  • the tuyeres can be arranged along several straight lines, parallel to one another, each of the straight lines being similar and parallel to that of FIG. 5.
  • FIG. 4 also shows, in its left-hand part, a porous plug 16 of known type, taking up the whole height of the erosive coat 13 and fed by a tube 17 of 27 mm external diameter, which passes through a cavity 18 in the safety coat 12, this cavity 18 having a diameter of approximately 30 mm.
  • a porous plug 16 of known type taking up the whole height of the erosive coat 13 and fed by a tube 17 of 27 mm external diameter, which passes through a cavity 18 in the safety coat 12, this cavity 18 having a diameter of approximately 30 mm.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
US06/370,652 1981-04-24 1982-04-21 Device for blowing swirling gas into a metal refinery converter Expired - Fee Related US4413815A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8108188 1981-04-24
FR8108188A FR2504664A1 (fr) 1981-04-24 1981-04-24 Dispositif de soufflage de gaz de brassage dans un convertisseur d'affinage des metaux

Publications (1)

Publication Number Publication Date
US4413815A true US4413815A (en) 1983-11-08

Family

ID=9257747

Family Applications (1)

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US06/370,652 Expired - Fee Related US4413815A (en) 1981-04-24 1982-04-21 Device for blowing swirling gas into a metal refinery converter

Country Status (6)

Country Link
US (1) US4413815A (es)
EP (1) EP0064449B1 (es)
JP (1) JPS57181319A (es)
AT (1) ATE10509T1 (es)
DE (1) DE3261349D1 (es)
FR (1) FR2504664A1 (es)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4565355A (en) * 1984-03-15 1986-01-21 Voest-Alpine Aktiengesellschaft Flushing arrangement for a metallurgical vessel
US4647020A (en) * 1983-12-12 1987-03-03 Arbed S.A. Gas-permeable element of a refractory material
US4741515A (en) * 1986-10-20 1988-05-03 Bethlehem Steel Corporation Apparatus for introducing gas into a metallurgical vessel
US4744546A (en) * 1986-02-03 1988-05-17 Voest-Alpine Aktiengesellschaft Flushing arrangement for a metallurgical vessel
US4758269A (en) * 1987-02-24 1988-07-19 Allegheny Ludlum Corporation Method and apparatus for introducing gas into molten metal baths
US4768756A (en) * 1986-03-10 1988-09-06 Hoogovens Groep B.V. Converter for preparing steel and a gas supply device for such a converter
US4840354A (en) * 1988-06-22 1989-06-20 Labate M D Stirring brick with shaped gas volume control openings

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH058548Y2 (es) * 1987-03-11 1993-03-03
DE3919238A1 (de) * 1989-06-13 1990-12-20 Voest Alpine Ind Anlagen Spueleinrichtung fuer ein metallurgisches gefaess

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3901445A (en) * 1974-11-08 1975-08-26 Pullman Inc Gas burner - lance construction
US4298192A (en) * 1978-05-26 1981-11-03 Barbakadze Dzhondo F Method of introducing powdered reagents into molten metals and apparatus for effecting same

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE609232A (fr) * 1961-10-16 1962-04-16 Centre Nat Rech Metall Perfectionnements aux procédés d'affinage de la fonte
LU54172A1 (es) * 1967-07-26 1969-05-21
FR2322202A1 (fr) * 1975-08-29 1977-03-25 Siderurgie Fse Inst Rech Procede d'elaboration d'acier par soufflage d'oxygene
FR2455008A1 (fr) * 1979-04-25 1980-11-21 Siderurgie Fse Inst Rech Piece refractaire a permeabilite selective et orientee pour l'insufflation d'un fluide

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3901445A (en) * 1974-11-08 1975-08-26 Pullman Inc Gas burner - lance construction
US4298192A (en) * 1978-05-26 1981-11-03 Barbakadze Dzhondo F Method of introducing powdered reagents into molten metals and apparatus for effecting same

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4647020A (en) * 1983-12-12 1987-03-03 Arbed S.A. Gas-permeable element of a refractory material
US4565355A (en) * 1984-03-15 1986-01-21 Voest-Alpine Aktiengesellschaft Flushing arrangement for a metallurgical vessel
US4744546A (en) * 1986-02-03 1988-05-17 Voest-Alpine Aktiengesellschaft Flushing arrangement for a metallurgical vessel
US4768756A (en) * 1986-03-10 1988-09-06 Hoogovens Groep B.V. Converter for preparing steel and a gas supply device for such a converter
US4741515A (en) * 1986-10-20 1988-05-03 Bethlehem Steel Corporation Apparatus for introducing gas into a metallurgical vessel
US4758269A (en) * 1987-02-24 1988-07-19 Allegheny Ludlum Corporation Method and apparatus for introducing gas into molten metal baths
US4840354A (en) * 1988-06-22 1989-06-20 Labate M D Stirring brick with shaped gas volume control openings

Also Published As

Publication number Publication date
JPS6157885B2 (es) 1986-12-09
DE3261349D1 (en) 1985-01-10
EP0064449A1 (fr) 1982-11-10
EP0064449B1 (fr) 1984-11-28
FR2504664A1 (fr) 1982-10-29
JPS57181319A (en) 1982-11-08
FR2504664B1 (es) 1983-06-03
ATE10509T1 (de) 1984-12-15

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